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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedba0d9727eb7499f197578e2bd4404e4f116936d3a724cef083a9f02d17583' 
  AND token = '/oF9eQJuwI3GG/52JXTkfh62JOvhYfpi7CM8pNH0pis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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