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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b010f4927fa08c50336e1b1bc38aa4cadf52ac95959485551cd6a9b3651517' 
  AND token = 'zDzsaD4NENVqKOkKl0KI4IaO4eVOKa0NNBXGUOwQ2mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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