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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5745687a24fb2886831f83a8469d638aa6d8cee2eb08a2175a27ce1563ecbd12' 
  AND token = '0WRRdiHeQgGcwartdkBJ86QkXJOHfPKKUQwO+V/24Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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