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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21de468a3b2cae65550b5312e24438406cd887d74758a1845fc8e2e2e1a38bbb' 
  AND token = 'BHRatXQvwRkX1CeZEnoPPczvZ5G2nHC+byjnuiDY5dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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