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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b926fba3ebd1e60d4a689ff5d27c95ea01a99272c6b6e2354fa614cdefc7f4' 
  AND token = 'Ld6tIHHoBZcMQFBKJQqqHLFTIr4LSjKrGCP3sleJyLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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