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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa78f3ccaaa26c65feb14779fb8b8dec4b91c6ee608c19e77ea74d585cccaa20' 
  AND token = '/1v+1j/TGTWwWfdmKKij7ZAT6m+elouz2owBrwmUbKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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