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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e1e3e5023300935ab4d370893cbfa44488e7779fff0beeffb0e4771b223885' 
  AND token = 'DWcf77Gmd3M5a86hXpC++dE/ntxaNRXOJnqIKE5DKv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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