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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178c6ba39f7353f28839d97c45cc4430a1f193318f97ccca9b033ce02144aab6' 
  AND token = '6PSRlTBbKYXloJrTe5jlGOjgmtO0r5orxRte48LLUsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}