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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991cabc7212d908d540aba65a1afa15dcbea86e5a0b5b528af7a43cf9dac9818' 
  AND token = 'CJNOpzxmv29zFA3r5s9BeloFzHEFa2uEsFkN37biFYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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