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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be265c4153078162dfe40668733b15db9145de7eabe36aeea52c1d342295a8a2' 
  AND token = 'm5c1UhtASVhTv8dAjomLF7P0noaOO0VkGyS1LuSuidM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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