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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd275c01a6092ce3509a3ff4d0b9b2c3302d5670f2eb6be30fdcfabd23524e6' 
  AND token = 'LrO8b7nvRoZYsFl6epF8uwMp/zoUAdzPFVDd3hh36i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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