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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a80b0b8328b9605e9035ccfbac5ca38a46861dfe5c693364591ccf5ac2474f' 
  AND token = 'M+r2tE4NCbmCvz6L47O+10W83UQzREwKQIMXbyE7jNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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