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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbeb284e0bab713fa10fd6d35d44c1b823c410c1f04072bc9c6038073808cad2' 
  AND token = '3nMoxRkO6XO10EJOS+teGMZ3yfafy54X+LUaf4/aTVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00161

JSON explain

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