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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcef77b1c46a018556cd4c203aee3d0c8d34272aeac88c3e0304d7d9232cd4cf' 
  AND token = 'gAcvfTTFz8qc8o5mp8u8xIrF0majPbJwHBhJ/e5+2CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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