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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013f6b281955346a6bfd605a1558cf3eec460f5f80db4bd21953559857ac9867' 
  AND token = 'SAIFcMOLgjBzAXx62W2HVMxl32z6MejfsZF/40Wv1/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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