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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afef39f9cebeab4f0e56882b128b6f9c69b1a25c3090e5e2b1d391ff404da5e4' 
  AND token = 'uBcEB/RDBVkOg7iNqySDpRF0B7hhJEinEU2UhTODr4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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