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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be86d90fb0a02d0dc5c7f149464ad53ea76a1aa12beb048a3a2f97d8f074b1d' 
  AND token = '5S7YdMHBFcaPzb7JOE/cQV7kHsI89U5bkLYZ2NxppwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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