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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16907a8531ef628f20f20cb93d55c744ebd0bf539a52e8463dcb2c58474e0bae' 
  AND token = 'i2gJyHytsY4GRuDCaPFVcp1ImZgZP6r/hZ3S5ZuX0cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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