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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a0f6740c5059ec28430a5a51567a4df470028fd09b7bc963e1de04c3453efb' 
  AND token = 'KTUYE7l+gXyr1rADLbqFnSKzgsMgajiJjUsVLjx3VOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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