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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a47f9775f43740fc65af658a5812c8de42b0d1f2b1032f30a00195d397f743' 
  AND token = '9wvdQKbsWeTrOZ+rLZ00MgbD9VMg/1mRSfT4Oiwos28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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