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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233ca9c7a52830914a6ebca995e9b6508caf2b0d568572412cf225149ddc4b6b' 
  AND token = '3cr75hL5lwG22kZcLtR8Z7/w4gsaSiqpz2GPsWJcIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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