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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b15b962bf4805d4fe6626d16640a03cdec046a779742d7b8f49cb391a4e6bcc' 
  AND token = 'LpLFdE4RH98Pr2dBMudDu6o4E4VlwyOgdBKWC4Oyb1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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