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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184d19aa2874be20f9ba9163868a2820c820ced6455ca57991305c9fe5c2d9d0' 
  AND token = 'lkHyMZv8tzrPEuaszX6oDpm1FFGkR2Ri4QKsmR5lxPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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