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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823b9ca64de9a768d67dcf50f39392c57ed71784a0a9df146d14f029d5317ae2' 
  AND token = 'dCFScbVkEo4NB89Rcw5vSROTAaZpygDzIEG+LxxCUWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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