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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0526e387f1850cb497a0825ea6d793053a17f101702cf75a74a7e2a14d678ac2' 
  AND token = 'Ftq14rYViD0aJCIkQCC26h7ozPASTf2EGNa54tzk2Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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