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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d1c99f676ba92426ad015a15f08c52e40d26ef0da533abefa56ae184518665' 
  AND token = 'ohf28QvUa2oBrxv4ySTvE66Lzuqu/3GjPphRix2hcq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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