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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4802d094cd6ca080aa00814857c3198851bc01be26561df30538afeefa137e' 
  AND token = 'xbYu++29tUGLfVBzMIhe8AF7AS7grdrgs2lli0WMmN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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