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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb1855b3ecd0222048d1c985197f2c352823cedd56af21cec1c97c0971e04c9' 
  AND token = '5gq9T2aBYVuzYiTSfh9+p6/09vbw/FdqUaSeb3txQBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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