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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c2430e569cb11eb5b8a7e61d89f2f04b06f5a4a9974c0bad2759b02ec63330' 
  AND token = 'eiQTB96Ql96MS3tU5sHtVTJEL10yW0w1Q5Xw0vLMm2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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