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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed99db198a511c18acb4983d66f81dd380d0dd020b842401431bb1cab75c9368' 
  AND token = 'xIfm0dAS89bjtkoa8bZYzVbVNW6l1GqjiqJrUsWhMsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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