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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7937ba25809f04eba3ad212fdee022b6174df8ba2d1c1e6bd0e077d4b92aff5c' 
  AND token = 'b9iB0c69osK5ka7HEI3YrwvJxcEs9+qKedU+FLt38Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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