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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b734b0d5a265d303533c90f278212fc007acc6bd1689eedbbeb98cd8a0f3422c' 
  AND token = 'In13BLRuTIV+ZKvv4AVJXS2TA5vdmtACnXglJeG7neo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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