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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df13e3aee505665d453e456289c4fdf4ad57f7f711c29737eaf4f3e844cd782' 
  AND token = 'L7MFxML+QsZswtcGKAL4iXsDNoS8OdAL2OGBypVz9Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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