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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48aa5d80ea450f6c09416190d3384b2205e7ffcd0d6ff714cf668621c9ecc96f' 
  AND token = 'mrOi9MmGNfYnSIRE26wft64I0r4s4YcCnkJROBMj/8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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