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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b399ceab5cb75d53c1e4d3208a3e491fd7c4c8c66ac6d5dd898440c864c83ac' 
  AND token = 'OeVVhEGYcpWr7Ouy/HhLouMvWKLXPyWXJ1S9MEET67A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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