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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c739a8937dd4df9792a1d8273780db8273a5d66f8556e16841ed5db0a52b395' 
  AND token = 'U0aIyWrozuFNIWCJb8EAbzJ9JLrYXTWyaIcEehjkFh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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