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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c60fb84c1f4bba84147d72d1be82df4a4b5937851349c16b9e57c51f02dcd1' 
  AND token = 'HQdHyE6UxX/A6Z2H/Lixd78UThTjWpqABQeW1gP58Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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