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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957a7c806bdff9d2483588684f4dbd609ff56710790cbaa6a11394377881af07' 
  AND token = 'uT6P7evyVahnMlxtptNl3GKMsIG/DyvfFkmUD4pFRpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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