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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6e9baf119e340545e4a9337e3ce6a88475f19489dd33fa26af4e26370f43a9' 
  AND token = '9GMoRGPN9u1afwVn7KJOrIBIRbsqwfQEzT3HhS857N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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