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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2184df187c1b5db6058a5d010596085d9679644f5e58b9d95b2ac691704b2099' 
  AND token = 'ibxbX2qfn2Nq6hasJJHQ6JswAATuX7ZYxUr/B/C2YT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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