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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cd97fa63d323d624c893bf16c206ac05ea74bd7776cd407427df06a9c8a2a2' 
  AND token = '08nTFN/jcAIi7MsUDFFjbiPTorYXr1Ah1vUnU3kasXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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