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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb4ea1e54c3b6e8dec9747243583dd2f838d4dcfd23b386d66e83e0b38c9395' 
  AND token = 'Z4DfaIx9MNDV9jnuFS8JFvRyWMrKCUQHzGbe2zP3mTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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