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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e46684b3a82ef74cccbf67621dd3f82857e12e1ec899770d03052ba3694d4a' 
  AND token = 'ajb2rc8EzigBdrwDhRnUCSkaLJVrC3GbRpt39uqcqhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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