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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae7db329d5a95b8622029a2d4e0b04ce0f4f74abd114c8095e5ada5b85a49ed' 
  AND token = 'RqHK0d1hTx9gP5KLUJJrzfaVNxLb0t7iecpYVS4/1H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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