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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba231527424802d409ab2eb77a2ce83e51eb9abd6da5e32fc285a993f6410e0e' 
  AND token = '4PZRjLdkNQ94PgVoqvPIZs7TfR7ylV2zfUjGTUZUrBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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