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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdde4286d3fe991c09be9168eef7e4282bdb22fc132562300b24f136f88643d' 
  AND token = 'Yqf6A5o0G3hAbFLmh1u5SAh9HrOdAAApOs3fY85v7f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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