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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a348346a9518f88d89c182d018640d2f97808102ff3007b283820e6c816bca' 
  AND token = 'LdiZGgE7CrJ9zTpVtb838qJuA0mfhUDGPz84R/J874U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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