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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac689e285e1c4ef5319092fb2eedf2d27b4c596e0b5de9eed90427ab52cab7e8' 
  AND token = 'Ad+df7qLwFmhBgJ5YkWIoDNQ4U1Jc69s8Hf5pbipAzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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