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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb4779813bfd950e44f6b74734ddc5440308ba0504f0d95fd23c215d1116652' 
  AND token = 'm7pOmHHtx2OF9PHXzaVRl4paoB1m+kZyMwt1IjCdLbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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