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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5c93060aefa521754463c21d9ae2e7291bac1bf1bad6b4368263821f9c58c2' 
  AND token = 'VNCTqIyQ+f2bX4Tdjo+mmUXEdL8M6ZMkY5Q3lgbqE5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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