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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7565cd5a52f46fd9e99d0c0ef82e795436103bb8ce243654888827d807e4e5c' 
  AND token = 'I7xbDY7nxNJncGofavxSkWgTp6zfiitKHVNi/mgnM10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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