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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb4e2d7fbf9f2dbf41f4a33e464c1b19f6fd177316469bb5274df27f09acaa1' 
  AND token = 'T5Q7wonIuHRChnAInnQj+1wknJ6Z/p+RYs3K7twbFfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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