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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1621e6e06ad7aebcdb9d3fa6f1190e607eae14c1ab2c207e45e2d933e0279be8' 
  AND token = 'Y68LKzZqbz/PjK8s1oFJT1dck/VrKEQ01xyteArua0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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