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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9075c02b62fb356e7c6e8ddd0a9950a88d63bf9f9fc05a6c6083030e64083568' 
  AND token = 'suGAp+Zeo1dNXGDva9yCl7z4Xj32KCFNofAQFrcSKI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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