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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77bfcd0e97525074356d54235a1976f3f8f15712e2e9e7e2ecc2bfa670a9d70' 
  AND token = '15Ljn9zziCXzUGAw+2Oll1MgkePrGZextXpBNpbOgKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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