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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff7590f89bd0b4955e0e1609abc1b35f31e950824a25b62f398fd4747450f63' 
  AND token = '8vL8ybvAOfmPjfyL9zgUKW7vGoA1/RRFs3BJi8WOOLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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