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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bdafd61d9e70c5773df003dd6ea62da78667327207eba189277a9039cc1397' 
  AND token = 'EUgEpWz0Dc2jg4AY3F/bBK7WVJY0+CAi8vmqxA5fZ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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