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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8459286c872b5952b1e22b5f393fd97671c607cf0271889d2adbd894a2e496' 
  AND token = 'qj48NnCC1AdEgCU/MKwA2sgkJ406uRTISOkLn0lTDIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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