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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e881b06e49a52c984fbf9f83ae8ae329e1790d70a06d04619849b17b57f6b1c2' 
  AND token = 'gNXcMx1dCJ5qJ1rzhF+cODcd+IHbPIyG4iIH61w+7dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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