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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725bd914d2922295b91638f2e826b03be598d1efda4a6b5a71396fd267cbec15' 
  AND token = 'OHd18nCHwAxA71c/MNXUhAUeZ9lD7XGjgKW1lT6n910=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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