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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a75b553818419c5d3a9bcd5d10b9ed91651c3f20b93b4410f9c22c56962663' 
  AND token = '186tyQWIXxKwXbsFrxJMwd/HNy3qNOAnZKsK0cKnPxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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