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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6857f84168c8216aef6b7fed8b1bd9810e9e4322fe105e5a952e18dddc698ae8' 
  AND token = 'daDWOYUZmtpkQ74RF1FTWpQ/ZFIb766m6239XXZCs2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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